Impact of the film?forming dispersion pH on the properties of yeast biomass films

BACKGROUND Yeast biomass, mainly composed of proteins and polysaccharides (mannans ?-glucans), has been proposed to develop films. pH can affect the solubility polysaccharides, structure cell wall, interactions between proteins. Considering potential impact these effects, yeast film-forming dispersions was studied from 4 11. RESULTS In tensile tests, samples increased their elongation by increasing pH, 7 ± 2% (pH 4) 29 5% 11), but Young's modulus not significantly modified. Regarding thermal degradation, maximum degradation rate temperature shifted 46 °C Differences in water vapour permeability, colour, opacity, roughness films were also found. According results differential protein assay, hydrophobic hydrogen bonding promoted at 4, disulfide bonds benefited 11, addition partial ?-glucan dissolution break-up alkali-sensitive linkage molecules wall. CONCLUSION The lead conclusion that film-functional characteristics greatly 11 comparison with regular dispersion 6). These could help understanding selecting conditions enhance desired properties biomass © 2021 Society Chemical Industry.